There’s nothing unbelievable about ETs coming or crashing here. Certainly Roswell has been badly muddied—almost certainly by design—but not disproven. In his latest book on the subject, KDR dismisses prosaic explanations, notably MOGUL, but says ET isn’t proven by lack of alternatives. It requires genuine documentation or other proof which was never forthcoming. I think someday it will be, but if The Alien Plan for Earth is to be believed, it may take until 2100, and require circumstances radically different from those prevailing now.
That's been my opinion for quite some time (unable to be understood, or reverse engineered; we couldn't make a human arm live again if we found one either).
For me, it is immaterial if Roswell "happened" or not, but I think it probably did. That's why folks like General MacCasland are interested in it: